Generally, open die forging will be used for larger shaft forgings. The shaft is a cylindrical object that goes through the middle of the bearing or the middle of the wheel or the middle of the gear, but there are also a few that are square. Shaft forgings are mechanical parts that support rotating parts and rotate with them to transmit motion, torque or bending moment. It is generally in the shape of a metal round rod, and each segment can have a different diameter.